package cn.ecut.dzy.controller;

import cn.ecut.dzy.entities.CommonResult;
import cn.ecut.dzy.entities.Payment;
import cn.ecut.dzy.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @program: sc2020sss
 * @description:
 * @author: DingZhenYun
 * @create: 2021-10-03 07:46
 **/

@Slf4j
@RestController
public class OrderController {

//    public static final String PAYMENT_URL="http://localhost:8001";


    // 重点是这里，改成 提供者在Eureka 上的名称，而且无需写端口号
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
    //取决于我们在提供者出配置的name，CLOUD-PAYMENY-SERVICE，
    // 同时要注意使用@LoadBalanced注解赋予RestTemplate负载均衡能力
    @Resource
    private RestTemplate restTemplate;
//
    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayMent(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class,id);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id){
        //   ResponseEntity是spring中的类
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);

        if(entity.getStatusCode().is2xxSuccessful()){
            return entity.getBody();//获取json
        }else{
            return new CommonResult<>(444,"操作失败");
        }
    }


    // ribbon用法
    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB(){
        // 找到服务列表
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");

        if(instances == null || instances.size() <= 0){
            return null;
        }
        // 负载均衡中选择一个服务
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin(){
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }
}
